A model of an atom was first created after the discovery of electrons by J.J. Thomson in 1897. He produced the “plum pudding” model seven years later in 1904, describing negatively-charged electrons as raisins set in a positively charged liquid-filled sphere.
It was not until Ernest Rutherford ran his gold-foil experiments when it is learned that atoms have a nucleus, a tightly packed center in which most of the positively-charged mass is located. The Rutherford planetary model of 1911 was soon improved upon by the Bohr model in 1913, which restricted electron movement to defined orbits around the nucleus in accordance to quantum theory.
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